ssh 登录 WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

重置了服务器的系统，再次通过 ssh 登录的时候，需要这个错误。

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@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:6PPclq4j/25+Ysddndfffdsdfwe7Lyj4JkXUMWkm0pc.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:15
ECDSA host key for vpsok.com  has changed and you have requested strict checking.
Host key verification failed.

这个错误表示远程主机的ECDSA密钥已经变更，与本地存储的密钥不匹配。可能的原因包括：

1. 远程服务器确实更换了密钥（比如重装系统）
2. 可能存在中间人攻击（虽然概率较低）
3. 服务器IP地址被重新分配给了另一台主机

解决方法 删除指定域名主机的记录

ssh-keygen -R [主机名或IP地址]

或者按照提示删除15行 /root/.ssh/known_hosts:15

Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:15